Surface-engineered Ti3C2Tx MXene enabling rapid sodium/potassium ion storage. (1st January 2023)

• Record Type: Journal Article
• Authors: Zhao, Yingying; Dong, Guangsheng; Zhang, Man; Wang, Dashuai; Chen, Yujin; Cao, Dianxue; Zhu, Kai; Chen, Guohua
• Is Part Of: 2D materials. Volume 10:Number 1(2023)
• Publication Date: 2023-01-01
• Subjects: ultrathin Ti3C2Tx -- surface engineering -- nitrogen modification -- sodium/potassium ion storage -- diffusion kinetics; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/ac96ff
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: MXene with expanding interlayer and tunable terminations emerge as promising candidates for metal ion storage. Herein, we develop a facile urea decomposition strategy to obtain ultrathin nitrogen-modified Ti3 C2 T x (N-UT-Ti3 C2 T x ) with optimized terminations as anode for sodium/potassium ion storage. Experimental results have shown that NH3 molecules produced by urea pyrolysis could introduce two types of nitrogen modifications in Ti3 C2, function substitution for –OH (FS) and surface absorption on –O (SA). During subsequent hydrothermal and heating processes, the nitrogen atoms in situ substitute the lattice carbon in Ti3 C2 (LS). Further, the effects of these nitrogen modifications in Ti3 C2 on diffusion kinetics of Na + and K + are investigated by first-principles calculations. The superior Na + storage performances of the N-UT-Ti3 C2 T x anode are the main attribute of the nitrogen modification of LS in Ti3 C2, while the excellent K + storage performances come from the synergistic effects of the nitrogen modifications of FS and LS in Ti3 C2 . This work emphasizes the effectiveness of surface engineering of nitrogen modifications and optimized terminations for improving the electrochemical performances of Ti3 C2 T x and inspires the design of heteroatom modified MXenes for energy storage.